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Datasheet: DCB-241 (Advanced Micro Systems)

 

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OVERVIEW
The DCB-241 is a combination bi-
polar chopper Driver and intelligent
Controller board for operating small
stepping motors. It is designed for low
cost O.E.M. applications, yet it
includes many enhanced operating
features found in products costing
much more:
1 amp/phase chopper drive output
AMS' Award Winning controller
Single 24 to 40 volt power supply
1/2 step resolution to 24k SPS
2k bytes of non-volatile memory
Limit, Home, Go and Stop inputs
Serial communication (1-32 axes)
Adjustable run current setting
Automatic hold current adjust
Programmable accel/decel ramping
Constant velocity commands
Heat-sink mounted
Mating connectors included
Free development software
DRIVER
For maximum performance, the DCB-
241 utilizes a bi-polar chopper drive
circuit with a 20kHz chopping rate.
The voltage range is from 24 to
40Vdc and the output current is up to
1.2 amps per phase. The run current
is set via a potentiometer. To
eliminate excess heat generated by the
motor, the hold current automatically
"folds-back" to a percentage of the
run current at the completion of a
move.
CONTROLLER
The on-board controller provides high
performance step and direction output
signals to the driver. It produces step
rates in excess of 24,000 steps per
second. The 24 bit position register
tracks steps within a 8,388,607 step
range.
An instruction set of over 30
commands, including: loop on port,
count delays, set/clear ports, limit and
home sensor inputs, provides
flexibility and programming ease.
SERIAL INTERFACE
Full duplex serial communications,
with an RS-422/485 "Party Line"
interface, helps to ensure reliable
communication in harsh industrial
environments. This protocol also
permits simultaneous communication
(to 32 axes) with minimum command
processing latency.
POWER SUPPLY
The DCB-241 uses a single,
unregulated +24 to 40Vdc power
supply. The on-board 5 volt logic
power is derived from the motor
power supply.
COMMANDS
ASCII
Description
ESC
Abort/Terminate
@
Soft Stop
^C
Reset
+
Index in Plus Direction
-
Index in Minus Direction
[
Read NV Memory
]
Read Limits, Hardware
\
Write to NV Memory
^
Read Moving Status
A
Port Read/Write (optional)
B
Jog Speed, Slow/Fast (optional)
C
Restore/Initialize
D
Divide Step Rates
E
Enable Auto Power Down
F
Find Home (SPS)
G
GO from Address
I
Initial Velocity (SPS)
J
Jump to Address
K
Ramp Slope
L
Loop on Port (optional)
M
Move at a Constant Speed
O
Set Origin
P
Program Mode
Q
Query Program
R
Index to Target Position
S
Store Parameters
T
Set Trip Point
V
Slew Velocity (SPS)
W
Wait "N" Milliseconds
X
Examine Parameters
Z
Display Position
PROGRAMS
Using a host computer or dumb terminal,
programs can be stored in non-volatile
memory (2k bytes) and initiated via the
serial communication port, the "GO" input
or auto-power-up.
INPUT SIGNALS
Input signals include: Home, Limit A & B,
Go, Soft Stop, and Ground. All signals
have a 5 volt range.
OPTIONAL I.O.
Three optional input ports are available that
can test and branch to multiple motion sub-
routines. Two programmable outputs are
also available to drive solid state relays and
other devices. A separate "TRIP" function
provides automatic program branching
when a specified position is passed.
SPECIFICATIONS
Electrical
Output Current (Peak)...................................................................................1.2 Amps
Chopping Frequency..........................................................................................20kHz
Input Voltage..........................................................................................+24 to 40Vdc
Motor Step Resolution..................................................................................Half Step
Non-Volatile Memory....................................................................................2k Bytes
Position Counter.........................................................................................8,388,607
Baud Rate.....................................................................................................9600 BPS
Thermal
Operating Temperature..............................................................................0 to +50
C
Storage Temperature............................................................................-40 to +125
C
Plate Temperature (max)...................................................................................+70
C
Mechanical
Size.............................................................................................4.13 x 5.20 x 1.38 In.
Weight..................................................................................................................8 Oz.
MOUNTING DIMENSIONS
ADVANCED MICRO SYSTEMS, INC. reserves the right to make improvements and changes in specifications or prices at any time without prior notification.
96254
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